<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		.header{
			height: 50px;
			border: 1px solid #0094ff;
		}
		@media screen and (max-width:1000px){
			.header{
				display: none;
			}
		}
	</style>
</head>
<body>
	<div class='header'>
		
	</div>
</body>
</html>